GAF Review for Wildfire-Resistant Fire-Rated Roofing

The research in brief

GAF is a good, conditional fit for Wildfire-Resistant Fire-Rated Roofing. Two of the seven platforms in this study named GAF during the ranking stage, and all seven evaluated it in the fit-research stage. Its strongest asset is documented UL 790 Class A capability for Timberline HDZ and Timberline Ultra HDZ shingle assemblies, supported by VersaShield fire-resistant underlayment and a closeable ember-related soffit vent. The main limitation is that Class A applies to a tested assembly, not to the GAF brand, and no supplied source establishes that a GAF roof automatically satisfies an insurer's wildfire requirement. Buyers must verify the exact listed assembly, local WUI code, vent listings, and insurer acceptance before signing.

Research Snapshot

Why GAF Qualified for This Study

Questions explored

• Why did GAF qualify for this wildfire-resistant fire-rated roofing study if only two platforms named it?
• Is GAF a large enough roofing brand to trust for a Class A wildfire roof?

GAF qualified because it cleared the study's minimum-mention threshold and because every included platform that evaluated fit returned a usable assessment of its Class A shingle assemblies. GAF is described in platform research as North America's largest roofing manufacturer and the maker of its best-selling architectural shingle, which is why it surfaced even in a wildfire-specific prompt ^[29].

The ranking stage and the fit stage measured different things. Only two platforms - Claude and Kimi - named GAF while listing recommended providers, at ranks 2 and 9 respectively. The remaining platforms did not name GAF in their ranked recommendations but still produced full fit evaluations when asked directly, and all seven fit ratings landed at "good" or "strong." That split is why the mention count is low while the fit evidence is comparatively rich.

One qualification note from the identity audit: official-site retrieval for gaf.com failed during this run, so the reported domain was retained for downstream research but remains unverified. No failed fetch was treated as a verified domain key.

The service or product in focus

Questions explored

• Which GAF shingle should a buyer choose for a wildfire-resistant Class A roof assembly?
• Is GAF Timberline HDZ or Timberline Ultra HDZ the better pick for a Class A fire-rated roof?

The relevant GAF configuration is Timberline HDZ or Timberline Ultra HDZ shingles installed as a listed UL 790 Class A roof assembly, paired with a qualifying fire-resistant underlayment such as VersaShield and, where required, compatible ember-resistant ventilation. All seven platforms converged on this same product family, though they described the governing listing differently.

GAF's own evaluation documentation identifies Timberline HDZ and Timberline Ultra HDZ as Class A when installed according to the report and GAF instructions, and GAF states that Timberline shingles carry a UL Class A fire rating listed to ANSI/UL 790 ^[10]. VersaShield Fire-Resistant Roof Deck Protection is documented as a component of UL-listed ANSI/UL 790 Class A systems when used with UL Class A shingles, and GAF publishes ICC-ES ESR-2053 for it ^[11]. GAF installation instructions state that felt underlayment must be installed over one layer of VersaShield to maintain the Class A fire rating for GAF asphalt shingles ^[12].

For ventilation, GAF offers Master Flow EmberShield Closeable Soffit Vents, intended to help prevent wildfire embers from being drawn into the attic when closed ^[19]. GAF's own guidance says these vents must remain open for normal ventilation and notes a wildfire-ember exclusion in the limited warranty ^[7].

What the AI Platforms Agreed About

Questions explored

• Do AI platforms agree that GAF Timberline shingles meet Class A fire-rated roofing requirements?
• Is GAF VersaShield underlayment necessary to keep a GAF Class A fire rating?

Platforms agreed on four points. First, GAF Timberline HDZ and Ultra HDZ shingles are documented as UL 790 Class A roof coverings when installed per GAF's evaluation report and instructions - stated by ChatGPT, Claude, Grok, Perplexity, Gemini, and Kimi ^[10]. Second, VersaShield is a recognized fire-resistant underlayment component in Class A assemblies ^[11]. Third, the Class A rating is assembly-dependent, not a property of the shingle alone ^[33]. Fourth, GAF sells through independent contractors rather than directly to homeowners, so pricing and workmanship accountability sit with the contractor ^[17].

Agreement here reflects consistent reading of GAF's published documentation. It does not establish that the product performs better than alternatives in a real wildfire, and no supplied source provides independent test data beyond the manufacturer's own listings.

Where the AI Platforms Disagreed or Were Uncertain

Platforms conflicted on the governing evaluation report number. The ranking-stage recommendation cited ESR-1475, and Grok, Perplexity, and Kimi repeated that reference ^[55]. However, the sources checked by ChatGPT did not verify ESR-1475 as the relevant Timberline document; the located GAF evaluation documentation was UL evaluation report ER21-01 ^[10]. Perplexity flagged the same tension, noting a third-party retail snippet showing an apparent UL 804 reference that conflicts with GAF documentation citing UL 790 ^[10]. Buyers should confirm the applicable current listing directly with GAF, UL, and the local building official rather than relying on either report number.

Platforms also split on overall fit strength. Google and Grok rated GAF a "strong" fit; ChatGPT, Claude, DeepSeek, Kimi, and Perplexity rated it "good" ^[13]. The disagreement tracks how each platform weighed asphalt combustibility against Class A compliance.

Uncertainty clusters in three areas. No supplied source establishes that a GAF roof automatically qualifies a property for insurance eligibility, discounts, or renewal ^[16]. No supplied source independently validates regional wildfire performance or contractor-level wildfire expertise ^[17]. And warranty coverage for the fire-rating component itself is not clearly documented - Claude noted that whether the fire-rating claim is covered under the Lifetime Limited Warranty or subject to separate exclusions is unclear ^[36].

Features for this home service need

Questions explored

• Does GAF offer ember-resistant venting to go with a Class A wildfire roof?
• Can GAF help a homeowner document compliance for a wildfire insurance requirement?

Class A fire rating is GAF's clearest advantage for this use case. GAF states that Timberline shingles have a UL Class A fire rating and are listed to ANSI/UL 790, and its evaluation documentation identifies Timberline HDZ and Timberline Ultra HDZ as Class A when installed in accordance with the report and GAF instructions ^[15].

Fire-resistant underlayment is a second documented strength. VersaShield is a component of UL-listed ANSI/UL 790 Class A systems when used with UL Class A shingles, and ICC-ES ESR-2053 identifies it as a fire-classified roof-assembly component ^[11]. Google's research states VersaShield is used as a component of wildfire-resistant, California CAL FIRE OSFM listed WUI assemblies ^[53].

Ember-resistant ventilation integration is partial. GAF offers Master Flow EmberShield Closeable Soffit Vents intended to help prevent embers from entering the attic when closed during a wildfire threat ^[19]. But GAF's documentation says these vents must remain open for normal ventilation and separately states that its limited ventilation-product warranty does not cover wildfire-ember damage ^[7]. Kimi's research found no evidence that GAF manufactures or bundles ember-resistant vents meeting the corrosion-resistant 1/8-inch mesh standard referenced in WUI codes ^[34].

Wildfire code compliance is neutral rather than a GAF advantage. California's WUI provisions require Class A roof assemblies in designated Fire Hazard Severity Zones and require qualifying flame- and ember-resistant vents for ventilation openings ^[25]. Class A is commonly required in wildfire-prone jurisdictions, but compliance depends on the complete roof and building design, local amendments, and installation - not the GAF brand alone.

Insurance eligibility support is a limitation. GAF provides contractor matching, cost-estimation tools, warranty information, and general insurance-navigation resources, but the sources checked do not establish that Timberline HDZ, Timberline Ultra HDZ, VersaShield, or a GAF-certified installation automatically qualifies for a homeowner's wildfire insurance requirement, discount, or renewal ^[17]. California's Safer from Wildfires regulation does list Class A fire-rated roofing as a qualifying action for insurance discounts, but that is a state framework, not a GAF guarantee ^[44].

Regional wildfire-zone experience is unclear. GAF has products and guidance relevant to wildfire exposure, but the sources checked do not provide independently verified regional performance data, wildfire-loss outcomes, or a nationwide roster demonstrating specialized wildfire-zone expertise for each local contractor ^[17]. GAF maintains a Master Elite contractor certification program, which reflects installer qualification rather than GAF-specific wildfire specialization ^[6].

Pricing, contracts, and ongoing costs

Questions explored

• How much does a GAF Class A wildfire-resistant roof cost per square installed?
• Are there hidden fees or warranty conditions that raise the cost of a GAF fire-rated roof?

No verified fixed price exists for a Timberline HDZ or Timberline Ultra HDZ wildfire-resistant Class A assembly. GAF offers a non-binding online estimate and directs homeowners to obtain a detailed quote from a local certified contractor ^[18].

Independent pricing sources give a range. Timberline HDZ materials run roughly $35 to $50 per bundle, or about $105 to $150 per square in materials alone, per one 2026 review ^[35]. A second source puts retail at approximately $46 to $55 per bundle, equating to roughly $140 to $165 per roofing square for materials only ^[29]. Installed cost lands at $450 to $700 per square in most US markets, or $4.50 to $7.00 per square foot installed ^[35]. A typical 2,000 square foot home installation ranges from $9,000 to $14,000 ^[35]. Grok reported material costs of $130 to $180 per square, a narrower and higher band than the other sources ^[30]. Google reported VersaShield underlayment at approximately $199.00 per 350 square foot roll ^[32].

Regional variation is substantial: Southeast $450–$575 per square, Northeast $575–$750, Mountain West $550–$700, and Pacific $600–$750 ^[35]. Anthropic rated its pricing confidence high; ChatGPT rated moderate; DeepSeek, Perplexity, and Kimi rated low. The spread reflects genuine regional and retailer variation rather than a single reliable figure.

Additional costs to expect include VersaShield or another qualifying fire-resistant underlayment, ember-resistant or closeable vents, flashing, valley treatment, gutters, permits, tear-off, disposal, and decking repairs ^[17]. No standard GAF homeowner installation contract or cancellation policy was verified; terms are set by the selected independent contractor, and the homeowner should review deposit, payment schedule, change-order, cancellation, workmanship-warranty, and dispute terms ^[17]. GAF states that certified contractors can offer its strongest warranties while also stating that certified contractors are independent businesses and not GAF employees or agents ^[17].

Best Suited For

Questions explored

• Who is GAF best suited for in a wildfire risk zone?
• Is GAF a good choice for a homeowner who needs Class A roofing to satisfy an insurer?

GAF is best suited for homeowners who want a mainstream asphalt-shingle roof with documented UL 790 Class A assembly options and who will use a GAF-certified contractor able to document the complete listed assembly and local-code compliance ^[10]. It fits projects that need integrated fire-resistant underlayment and available ember-resistant or closeable ventilation components ^[11].

It also fits buyers in moderate-to-high wildfire risk zones where Class A asphalt shingles satisfy local code and where noncombustible material is not mandated ^[26]. Budget alignment matters: the mid-tier installed range of $450 to $700 per square makes Class A certification accessible compared with premium designer or noncombustible alternatives ^[35]. Buyers who want a familiar shingle appearance, wide contractor availability, and a single major brand for shingles and underlayment are the clearest match ^[29].

Probably Not Best Suited For

Questions explored

• Who should not choose GAF for wildfire-resistant fire-rated roofing?
• Is GAF a poor fit for a home in an extreme wildfire severity zone?

GAF is probably not best suited for buyers in extreme wildfire severity zones or jurisdictions that mandate noncombustible roofing. Asphalt shingles remain a combustible covering; Class A is a tested-assembly rating, not a noncombustible designation ^[21]. Industry sources note that fiberglass asphalt shingles rated Class A can still ignite and degrade under sustained ember contact, and that aged, curled shingles trap embers ^[46].

It is also a weaker fit for buyers who need a single-vendor wildfire-mitigation package covering ember-resistant vents, edge metal, flashing, and defensible space integration, because the sources checked do not show GAF offering that as a bundled system ^[10]. Buyers who need guaranteed insurance approval without verifying local underwriter and code requirements should look elsewhere, since no supplied source establishes automatic eligibility ^[16]. Finally, buyers who want to self-install or use a non-certified roofer and still rely on GAF system warranties are a poor match, because warranty and Class A documentation may depend on using a certified installer and specified components ^[23].

When Another Option May Be Better

Questions explored

• What is a better alternative to GAF for a buyer whose code requires noncombustible roofing?
• When should a buyer choose metal or tile instead of a GAF Class A asphalt assembly?

Another option may be better in four situations. First, when the jurisdiction requires a specific WUI-tested roof assembly, listed ember-resistant vents, or noncombustible roofing rather than a general UL 790 Class A assembly ^[25]. Second, when the insurer requires documentation from a particular testing program, roof certification, or inspection provider that the proposed GAF installation cannot supply ^[16]. Third, when the buyer wants metal, tile, slate, or another covering selected primarily for noncombustibility or higher wildfire exposure resistance ^[46]. Fourth, when a competing contractor can provide more clearly documented local wildfire-zone experience, complete assembly testing, and insurer or code-official acceptance ^[17].

Noncombustible alternatives named in the supplied research include Interlock aluminum, DECRA steel, CeDUR synthetic shakes, and clay or concrete tile ^[46]. Notably, VersaShield appears as a specified underlayment component in some of those third-party Class A assemblies, including DECRA's ESR-2901 listing, which means GAF can remain part of a noncombustible roof system even when its own shingles are not the covering ^[28].

Questions to ask before choosing a provider

• What exact UL 790 Class A assembly number applies to this home's deck type, slope, shingle model, underlayment, ventilation, flashing, and fastening pattern ^[10]?
• Can the contractor provide the current UL listing, GAF installation instructions, and any applicable evaluation report for the proposed assembly ^[10]?
• Does the local building department require additional WUI measures for vents, eaves, rakes, valleys, gutters, skylights, solar equipment, or attic openings ^[25]?
• Are the proposed vents listed or approved under the local wildfire code, such as the applicable California State Fire Marshal or ASTM E2886 requirements ^[19]?
• Will the insurer accept this exact assembly for underwriting, renewal, or any wildfire-related discount, and what documentation is required ^[16]?
• Is the installer currently GAF-certified at the level needed for the quoted warranty, and what workmanship warranty is provided separately ^[17]?
• Are VersaShield and all other accessories included in the written quote, with product names, quantities, installation details, and substitutions prohibited without approval ^[11]?
• What costs are excluded for tear-off, damaged decking, permits, disposal, attic ventilation changes, ember-resistant vents, and code upgrades ^[17]?
• Does any product or system warranty exclude wildfire, ember, flame, smoke, or fire-related damage ^[7]?
• Would a metal, tile, slate, or another WUI-tested system better satisfy the insurer or jurisdiction for this specific property ^[25]?

The consensus assessment

GAF is a good, but conditional, fit for wildfire-resistant fire-rated roofing. Timberline HDZ or Timberline Ultra HDZ can be part of a UL 790 Class A assembly, and GAF offers compatible fire-resistant underlayment and ember-related ventilation products ^[10]. Six of seven platforms rated the fit "good" and two rated it "strong," with no platform rating it poor.

The buyer should proceed only after the contractor documents the exact listed assembly, local WUI compliance, vent requirements, insurer acceptance, and all wildfire-related exclusions. GAF should not be treated as an automatic insurance-eligibility solution or as a substitute for whole-home wildfire hardening. The unresolved ESR-1475 versus ER21-01 conflict, the absence of verified insurance-eligibility outcomes, and the unclear warranty treatment of fire-rating components are the three items most likely to change a buyer's decision.

How This Review Was Produced

This review synthesizes fit-research responses from seven AI platforms - ChatGPT, Claude, DeepSeek, Gemini, Grok, Kimi, and Perplexity - each asked whether GAF is a good choice for a homeowner in a wildfire risk zone who needs a fire-rated roof to meet insurance requirements or local defensible space codes. Two platforms named GAF during the ranking stage; all seven produced fit evaluations. Platform fit ratings were good for ChatGPT, Claude, DeepSeek, Kimi, and Perplexity, and strong for Gemini and Grok. All citations are platform-reported evidence, not independently verified facts. The consensus index for this category is Wildfire resistant fire rated roofing, which lists the other providers evaluated under the same prompt.

Buyers comparing GAF against other providers in this category can browse the full roofing services directory for related fit reviews.

Research limitations

Several limitations apply. The authoritative run research date is 2026-10-01, but DeepSeek reported a platform research date of 2026-02-14; platform-reported dates are provenance metadata and do not independently prove freshness. Official-site retrieval for gaf.com failed during this run, so the reported domain remains unverified and no failed fetch was used as a verified domain key. The supplied URLs were collected from platform responses and were not independently validated by the writer stage.

The ranking-stage recommendation cited ESR-1475, but the sources checked did not verify that report as the relevant Timberline document; GAF's located evaluation documentation was ER21-01. GAF product pages use broad language about upgrading roof classifications, while detailed documents state that actual ratings depend on specified assemblies and installation conditions. No public fixed price, standardized national contract, or universal insurance-eligibility policy was found. The sources checked do not independently validate regional wildfire performance or contractor-level wildfire expertise. Deepseek's research ran without search enabled, so its claims are platform-reported rather than retrieved. Platform agreement on Class A documentation reflects consistent reading of manufacturer materials and does not prove product quality or real-world wildfire performance.

Sources

Company-Owned Sources

1. UL Evaluation Report UL ER21-01 Issued: February 20, 2019: https://documents.gaf.com/codes/timberline-evaluation-report-ul-er21-01.pdf
2. VersaShield Fire-Resistant Roof Deck Protection Sell Sheet: https://documents.gaf.com/data-sheets/versashield-fire-resistant-roof-deck-protection-sell-sheet-resgn222.pdf
3. Timberline HDZ product page: https://gaf.com/en-us/roofing-materials/residential-roofing-materials/shingles/timberline-hdz
4. Understanding ASTM E108: The Gold Standard for Fire-Resistant Roofing: https://www.cedur.com/astm-e108/
5. GAF Find a Contractor: https://www.gaf.com/en-us/contractors
6. GAF Master Elite Contractor Program: https://www.gaf.com/en-us/contractors/master-elite
7. GAF Steep-Slope Pro Field Guide: https://www.gaf.com/en-us/document-library/documents/brochures-%26-literature/gaf-residential-full-line-reference-guide-canada-resgn100c.pdf
8. We protect what matters most™ - GAF Roofing: https://www.gaf.com/en-us/document-library/documents/brochures-&-literature/brochure__timberline_collection_canada__english_restl104.pdf
9. ICC-ES Evaluation Report ESR-2053: https://www.gaf.com/en-us/document-library/documents/codes/esr-2053---7-1-22.pdf
10. UL Mark Document Compiler Applicant / GAF evaluation report: https://www.gaf.com/en-us/document-library/documents/codes/timberline-evaluation-report-ul-er21-01.pdf
11. VersaShield Fire-Resistant Roof Deck Protection sell sheet: https://www.gaf.com/en-us/document-library/documents/data-sheets/versashield-fire-resistant-roof-deck-protection-sell-sheet-resgn222.pdf
12. Installation Instructions* Instrucciones de Instalación*: https://www.gaf.com/en-us/document-library/documents/installation-instructions-&-guides/timberline-layerlock-installation-instructions-trilingual-restl622.pdf
13. GAF Shingle Standards and Code Approvals: https://www.gaf.com/en-us/document-library/documents/residentialroofingdocuments/shinglesdocuments/shinglestandardsandcodeapprovals.pdf
14. Engineered to be first. Built to last: https://www.gaf.com/en-us/document-library/documents/specifications/timberline-hdz-shingles-spec-sheet-canada-resgn467hdzc.pdf
15. How to choose the best roofing shingles for your home: https://www.gaf.com/en-us/plan-design/design-your-roof/how-to-choose-roof-shingles
16. GAF homeowner education resources: https://www.gaf.com/en-us/plan-design/homeowner-education
17. Roof replacement costs and GAF-certified contractors: https://www.gaf.com/en-us/plan-design/homeowner-education/roof-cost
18. GAF replacement roof cost calculator: https://www.gaf.com/en-us/plan-design/homeowner-education/roof-cost/calculator
19. Master Flow EmberShield Closeable Soffit Vent: https://www.gaf.com/en-us/roofing-materials/residential-roofing-materials/attic-vents-other-ventilation/master-flow-embershield-closeable-soffit-vent
20. Timberline HDZ: GAF's #1-selling shingle - GAF Roofing: https://www.gaf.com/en-us/roofing-materials/residential-roofing-materials/shingles/timberline-hdz
21. GAF Roofing Products: https://www.gaf.com/en-us/roofing-products
22. VersaShield® Fire-Resistant Roof Deck Protection: https://www.gaf.com/en-us/roofing-products/residential-roofing-products/roof-deck-protection/versashield
23. GAF Warranty Information: https://www.gaf.com/en-us/warranties
24. Metal Cedar Shingle - Class A Fire-Rated Assembly ESR-1790: https://www.interlockroofing.com/metal-roofing/aluminum/cedar-shingle/

Independent Sources

25. 2022 California Building Code Chapter 7A: https://codes.iccsafe.org/content/CABC2022P2/chapter-7a-sfm-materials-and-construction-methods-for-exterior-wildfire-exposure
26. Fire-Resistant Roofing: What California Homeowners Need to Know: https://defensiblespacescore.com/blog/fire-resistant-roofing-california-guide/
27. Insurance Institute for Business and Home Safety Wildfire Resources: https://ibhs.org/wildfire/
28. ESR-2901 - Decra Roofing Systems, Inc: https://icc-es.org/wp-content/uploads/report-directory/ESR-2901.pdf
29. GAF Timberline HDZ Shingles, Colors, Cost & Warranty Guide 2026: https://roof-installation.com/gaf-timberline-hdz-shingles/
30. GAF Shingles: Good, Better, Best: https://roofingstormdamage.com/shingle-brands/gaf
31. Wildfire-Resistant Roofing in California: Complete Guide (2026: https://roofvista.com/resources/guides/wildfire-roofing-california
32. GAF VersaShield Underlayment Pricing: https://scmetals.com/products/gaf-versashield-underlayment
33. Do Roofing Shingles Burn? Fire Ratings Guide (2026: https://skyridgeco.com/do-roofing-shingles-burn-2026
34. Fire Resistant Roofing: Class A Materials & Wildfire - Standalone vs Assembly: https://theroofingbrief.com/fire-resistant-roofing/
35. GAF Timberline HDZ Review (2026): Specs, Price, Verdict: https://theroofingbrief.com/gaf-timberline-hdz-review/
36. GAF Timberline HDZ Review: Is It Worth the Cost? (2026: https://weathershieldroofers.com/blog/gaf-timberline-hdz-review/
37. GAF Timberline HDZ Cost Per Square (2026 Prices: https://whatdoesaroofcost.com/gaf-timberline-review/
38. UL Evaluation Report UL ER21-01: https://www.a1roofingcompany.com/wp-content/uploads/2020/10/Timberline_HDZ_Timberline_AH_and_Timberline_CS__UL_Evaluation_Report_ER2101.pdf
39. ASTM E108 Standard Test Methods for Fire Tests of Roof Coverings: https://www.astm.org/e0108-20.html
40. California Wildfire Building Code and Defensible Space: https://www.fire.ca.gov/
41. Timberline HDZ Hickory Laminated High Definition Roof Shingles: https://www.homedepot.com/p/GAF-Timberline-HDZ-Hickory-Laminated-High-Definition-Roof-Shingles-33-33-sq-ft-per-Bundle-21-Pieces-0489395/313889054
42. Reviews for GAF VersaShield 350 sq. ft. Fire-Resistant Roofing Underlayment Roll: https://www.homedepot.com/p/reviews/GAF-VersaShield-350-sq-ft-Fire-Resistant-Roofing-Underlayment-Roll-0904000/206560036/1
43. Insurance Requirements for Wildfire-Prone Homes: https://www.insurance.ca.gov/
44. FAQ: Safer from Wildfires Regulation (September 2026: https://www.insurance.ca.gov/01-consumers/105-type/95-guides/03-res/upload/FAQ-Safer-from-Wildfire-Regulation.pdf
45. Fire-Resistant Roofing Systems | Class A Fire Rated Available: https://www.interlockroofing.com/fire-resistant-roofing/
46. Fire-Resistant Roofing Systems: https://www.interlockroofing.com/fire-roofing/
47. GAF Timberline HDZ Charcoal Algae Resistant Architectural Roof Shingles: https://www.lowes.com/pd/GAF-Timberline-HDZ-Charcoal-Algae-Resistant-Architectural-Roof-Shingles-33-33-sq-ft-per-Bundle/1001327246
48. GAF Timberline HDZ Weathered Wood Algae Resistant Architectural Roof Shingles: https://www.lowes.com/pd/GAF-Timberline-HDZ-Weathered-Wood-Algae-Resistant-Architectural-Roof-Shingles-33-33-sq-ft-per-Bundle/1001327156
49. NFPA Wildfire Preparedness and Roof Vents: https://www.nfpa.org/
50. UL 790 Standard for Fire Tests of Roof Coverings: https://www.ul.com/services/ul-790-fire-tests-roof-coverings

Other Sources

51. Residential Reference Guide - Syndigo: https://content.syndigo.com/asset/6366671c-ec20-479d-9d0d-b8f138557a59/original.pdf
52. GAF Shingle Roof Covering Systems Evaluation Report ESR-1475: https://manuals.plus/m/a5ab090c3d3e08288d2394f732954cd2f1c30ef0a16bdb9a3cf2a0f918b1cce0
53. State Fire Marshal Listed Wildland Urban Interface (WUI) Products: https://osfm.fire.ca.gov/
54. GAF VersaShield attachment example: https://pine-trk.aspgov.com/eTRAKiT/viewAttachment.aspx?Group=PERMIT&ActivityNo=BL2023-0097&key=ECON:230221040732655
55. Code GAF Shingle Products ICC ESR1475: https://www.scribd.com/document/655492991/Code-GAF-Shingle-Products-ICC-ESR1475